Web / SEO
HTTP Security Headers Checker
Check pasted HTTP response headers for common security headers, risky values, missing protections, and browser-side recommendations.
Local-onlyNo uploadhttpheaderssecurity
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DevToolkit
All toolsBrowser-only toolbox collections
Tool collection
Security Header & Certificate Tools
Browser-based helpers for checking security headers, decoding certificates, reviewing CSRs, and spotting risky web configuration patterns.
Browser-onlyLocal-onlyNo upload
What this solves
Use this collection for preflight security reviews around headers, CORS, certificates, CSRs, tokens, passwords, and hashes.
Best for
Security-minded developers, DevOps teams, and self-hosters who want browser-only helpers for common configuration review tasks.
Tools
Related tools in this collection
These tools run in your browser. Review generated snippets, warnings, paths, headers, and credentials before using them in production.
Web / SEO
CORS Header Generator / Checker
Generate CORS headers and config snippets for Nginx, Caddy, Express.js, Cloudflare Workers, and Vercel in your browser, with warnings for wildcard origins, credentials, and preflight issues.
Local-onlyNo uploadcorsheadersaccess-control-allow-origin
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Network
SSL Certificate Decoder
Decode PEM SSL certificates in your browser and inspect subject, issuer, SANs, validity dates, expiration status, algorithms, and fingerprints before you wire them into a proxy.
Local-onlyNo uploadsslcertificatex509
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Network
CSR Decoder
Decode PEM certificate signing requests in your browser and inspect subject, common name, SANs, public key details, signature algorithm, and fingerprints.
Local-onlyNo uploadcsrcertificate signing requestrequest
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Encoding
JWT Decoder
Decode JWT headers and payloads in your browser without verifying signatures.
Local-onlyNo uploadjwttokendecoder
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Generators
Password Generator
Generate random passwords with configurable length and character types.
Local-onlyNo uploadpasswordgeneratorrandom
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Generators
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes for text in your browser.
Local-onlyNo uploadhashmd5sha1
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